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Ha, Ok-Nam,Hong, Suck-Ju,Youn, Kab-Sik,Lee, Jong-In,Kwon, Il-Wook,Lee, Seung-Jae,Jeon, Sang-Sin,Ha, Kyung-Soo,Jung, Song-Tae 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2
Since the use of CFC and HCFC refrigerants are to be restricted due to the depletion of ozone layer, this experiment applies the NH₃ gas to study the performance characteristics from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 14.5 bar to 16.0 bar by 0.5 bar and for superheat temperature from O℃ to 10℃ by 1℃ at each condensing pressure. As a result of experiment, when the superheat temperature is 1℃ at each condensing pressure, the refrigeration system has the highest performance.
Ovarian dysgerminoma with Mullerian anomaly: a case report
( Ha Na Kim ),( Jung Mi Byun ),( Jin Ok Park ),( Hye Kyoung Yoon ),( Da Hyun Kim ),( Dae Hoon Jeong ),( Young Nam Kim ),( Kyung Bok Lee ),( Moon Su Sung ) 대한산부인과학회 2020 Obstetrics & Gynecology Science Vol.63 No.1
Mullerian anomalies are rare deformities in women, and only a few cases concerning gynecologic malignancies arising in patients with congenital uterine malformations have been reported. Herein, we present the case of a 34-yearold woman with dysgerminoma with a Mullerian anomaly (uterus didelphys). She had secondary amenorrhea, and an ovarian mass and uterus didelphys were discovered during examination. After right salpingo-oophorectomy, the tumor was confirmed as dysgerminoma, and a chromosome study revealed a normal female karyotype (46, XX). The patient completely responded to 6 cycles of chemotherapy. To our knowledge, this is the first reported case of dysgerminoma with uterus didelphys. Although gynecologic malignancies in patients with Mullerian anomalies are very rare, clinicians should be aware of the coexistence of gynecologic malignancies and uterine malformations.
Study on performance test of orchard tractor power transmission systems
Nam-Seok Sung,Dong-Il Chang,Yun-Kun Huh,Sun-Ok Chung,Jong-Seung Cho,Jong-Kyou Ha 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.3
This study started to export an orchard tractor to Europe under the situations that R&D activities for orchard tractor were marginal and even it was not produced. The R&D for orchard tractor has been progressed and the most of it is accomplishing the goal. In this study, the durability of clutch friction part was tested for F/R clutch and moment of inertia of PTO clutch, and it was compared with the design criteria of transmission of tractor. According to the results of inertia test of F/R clutch, hydraulic pressures of clutch satisfied 1,961.33 ± 196.13 ㎪ of design criteria, and the variations of torque for forward and reverse operation were relatively constant. Therefore, it was found that the durability of clutch friction part was stable and reliable. Test results showed that the main hydraulic pressures were maintained 1,961.33 ± 196.13 ㎪ during the tests of moment of inertia of PTO clutch, and when it was operated, the hydraulic pressures were reached 1,961.33±196.13 ㎪. Therefore, it was found that the hydraulic pressures of PTO satisfied the design criteria. By the results that the time of the hydraulic pressures of PTO reaching main hydraulic pressure, and that of torque values restoring to the original was same as the time of the first gear of PTO reaching the maximum rotational speed, it was found that PTO could transfer power to attachments as it was designed.
Comparion of stability in titanium implants with different surface topographies in dogs
Nam-Sook Kim,Mong-Sook Vang,Hong-So Yang,Sang-Won Park,Ha-Ok Park,Hyun-Pil Lim 대한치과보철학회 2009 The Journal of Advanced Prosthodontics Vol.1 No.1
STATEMENT OF PROBLEM. A few of studies which compared and continuously measured the stability of various surface treated implants in the same individual had been performed. PURPOSE. We aim to find the clinical significance of surface treatments by observing the differences in the stabilization stages of implant stability. MATERIAL AND METHODS. Eight different surface topographies of dental implants were especially designed for the present study. Machined surface implants were used as a control group. 4 nano-treated surface implants (20 nm TiO2 coating surface, heat-treated 80 nm TiO2 coating surface, CaP coating surface, heat treated CaP coating surface) and 3 micro-treated surface implants [resorbable blast media (RBM) surface, sandblast and acid-etched (SAE) surface, anodized RBM surface] were used as experiment groups. All 24 implants were placed in 3 adult dogs. Periotest® & ISQ values measured for 8 weeks and all animals were sacrificed at 8 weeks after surgery. Then the histological analyses were done. RESULTS. In PTV, all implants were stabilized except 1 failed implants. In ISQ values, The lowest stability was observed at different times for each individual. The ISQ values were showed increased tendency after 5 weeks in every groups. After 4 to 5 weeks, the values were stabilized. There was no statistical correlation between the ISQ values and PTV. In the histological findings, the bone formation was observed to be adequate in general and no differences among the 8 surface treated implants. CONCLUSIONS. In this study, the difference in the stability of the implants was determined not by the differences in the surface treatment but by the individual specificity.
Nam Gyu Choi,Ok In Moon,Jin Ha Kim,Sharon Lim,Sung Chul Lim,Jun Lee,Kyung Jong Kim 대한외과학회 2013 Annals of Surgical Treatment and Research(ASRT) Vol.84 No.4
The location of the sigmoid colon varies within the abdominal cavity, but its mesocolon is fixed to the left side. Right side fixation of the sigmoid colon is a very rare congenital positional anomaly. In addition, it has been reported that hepatocolic fistula is also a very rare disease that may present lower gastrointestinal bleeding. Here, the authors describe a case of a 71-year-old man who underwent surgery for hepato-sigmoidocolic fistula complicated by hepatocellular carcinoma and the right side fixation of the sigmoid colon.
Ha, Ok-Nam,Kwon, Il-Wook,Hong, Suck-Ju,Kim, Jae-Yeol,Lee, Jong-In,Jeon, Sang-Sin,Ha, Kyung-Soo,Lee, Seung-Jae,Park, Chan-Soo,Jeong, Song-Tae 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2
Since the use of CFC and HCFC refrigerants is to be restricted due to the depletion of ozone layer, this experiment applies the NH3 gas to study the performance characteristics from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 1500kPa to 1600kPa by 50kPa and for degree of superheat from 0℃ to 10℃ by 1°C at each condensing pressure. As a result of experiment, 1) As degree of superheat increased, evaporating pressure of the compressor decreased so equilibrium temperature decreased. And specific volume of refrigerant vapors increased so refrigerant mass flow and heat load of the evaporator decreased. 2) An influence of change of condensing pressure on heat load of the evaporator was insignificant. 3) With the identical degree of superheat, change of compressed temperature was insignificant according to each condensing pressure, so there was little change in enthalpy. 4) when the degree of superheat is 0℃ at each condensing pressure, the refrigeration system has the highest performance.